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The Challenges of Dynamic Network Interfaces
The Challenges of Dynamic Network Interfaces by Brooks Davis brooks@{aero,FreeBSD}.org The Aerospace Corporation The FreeBSD Project EuroBSDCon 2004 October 29-31, 2004 Karlsruhe, Germany Introduction ● History of Dynamic Interfaces ● Problems ● Possible Solutions ● Advice to Implementors ● Future Work Early UNIX ● Totally static. ● All devices must be compiled in to kernel ● Fast and easy to program ● Difficult to maintain as the number of devices grows Autoconfiguration ● Introduced in 4.1BSD (June 1981) ● One kernel can serve multiple hardware configurations ● Probe – Test for existence of devices, either using stored addresses or matching devices on self-identifying buses ● Attach – Allocate a driver instance (as of 6.0, this must be fully dynamic) Kernel Modules ● Allows drivers to be added at run time ● LKM (Loadable Kernel Modules) – Introduced in 2.0 by Terry Lambert – Modeled after the facility in SunOS ● KLD (dynamic kernel linker) – Introduced along with newbus in 3.0 by Doug Rabson – Added a generic if_detach() function PC Card & CardBus ● Initial PC Card (PCMCIA) support via PAO in 2.0 ● Fairly good support in 3.0 ● Most PAO changes merged in 4.0 – PAO development ceased ● CardBus support in 5.0 Other Removable Devices ● USB Ethernet (4.0) ● Firewire (fwe(4) in 4.8, fwip(4) in 5.3) ● Bluetooth (5.2) ● Hot plug PCI ● Compact PCI ● PCI Express ● Express Card Netgraph ● Node implement network functions ● Arbitrary connection of nodes allowed ● ng_iface(4) node creates interfaces on demand Interface Cloning ● Handles most pseudo -
Introduzione Al Mondo Freebsd
Introduzione al mondo FreeBSD Corso avanzato Netstudent Netstudent http://netstudent.polito.it E.Richiardone [email protected] maggio 2009 CC-by http://creativecommons.org/licenses/by/2.5/it/ The FreeBSD project - 1 ·EÁ un progetto software open in parte finanziato ·Lo scopo eÁ mantenere e sviluppare il sistema operativo FreeBSD ·Nasce su CDROM come FreeBSD 1.0 nel 1993 ·Deriva da un patchkit per 386BSD, eredita codice da UNIX versione Berkeley 1977 ·Per problemi legali subisce un rallentamento, release 2.0 nel 1995 con codice royalty-free ·Dalla release 5.0 (2003) assume la struttura che ha oggi ·Disponibile per x86 32 e 64bit, ia64, MIPS, ppc, sparc... ·La mascotte (Beastie) nasce nel 1984 The FreeBSD project - 2 ·Erede di 4.4BSD (eÁ la stessa gente...) ·Sistema stabile; sviluppo uniforme; codice molto chiaro, ordinato e ben commentato ·Documentazione ufficiale ben curata ·Licenza molto permissiva, spesso attrae aziende per progetti commerciali: ·saltuariamente esterni collaborano con implementazioni ex-novo (i.e. Intel, GEOM, atheros, NDISwrapper, ZFS) ·a volte no (i.e. Windows NT) ·Semplificazione di molte caratteristiche tradizionali UNIX Di cosa si tratta Il progetto FreeBSD include: ·Un sistema base ·Bootloader, kernel, moduli, librerie di base, comandi e utility di base, servizi tradizionali ·Sorgenti completi in /usr/src (~500MB) ·EÁ giaÁ abbastanza completo (i.e. ipfw, ppp, bind, ...) ·Un sistema di gestione per software aggiuntivo ·Ports e packages ·Documentazione, canali di assistenza, strumenti di sviluppo ·i.e. Handbook, -
The Pfsense Book Release
The pfSense Book Release The pfSense Team May 10, 2017 CONTENTS 1 Preface 1 1.1 Acknowledgements...........................................1 1.2 Feedback.................................................3 1.3 Typographic Conventions........................................3 1.4 Authors..................................................4 2 Foreword 7 3 Introduction 9 3.1 What does pfSense stand for/mean?...................................9 3.2 Why FreeBSD?..............................................9 3.3 Common Deployments.......................................... 10 3.4 Interface Naming Terminology..................................... 11 3.5 Finding Information and Getting Help.................................. 12 3.6 Project Inception............................................. 13 4 Networking Concepts 15 4.1 Understanding Public and Private IP Addresses............................. 15 4.2 IP Subnetting Concepts......................................... 16 4.3 IP Address, Subnet and Gateway Configuration............................. 16 4.4 Understanding CIDR Subnet Mask Notation.............................. 17 4.5 CIDR Summarization.......................................... 18 4.6 Broadcast Domains............................................ 19 4.7 IPv6.................................................... 19 4.8 Brief introduction to OSI Model Layers................................. 32 5 Hardware 33 5.1 Minimum Hardware Requirements................................... 33 5.2 Hardware Selection........................................... 33 -
The Challenges of Dynamic Network Interfaces
The Challenges of Dynamic Network Interfaces Brooks Davis The FreeBSD Project Seattle, WA brooks@{aero,FreeBSD}.org Abstract vices to the modern age of near complete dynamism. Following this history, the problems caused by this dynamism are discussed in detail. Then solutions to On early BSD systems, network interfaces were some of these problems are proposed and analyzed, static objects created at kernel compile time. To- and advice to implementers of userland applications day the situation has changed dramatically. PC is given. Finally, the issues are summarized and fu- Card, USB, and other removable buses allow hard- ture work is discussed. ware interfaces to arrive and depart at run time. Pseudo-device cloning also allows pseudo-devices to be created dynamically. Additionally, in FreeBSD and Dragonfly, interfaces can be renamed by the ad- 2 History ministrator. With these changes, interfaces are now dynamic objects which may appear, change, or dis- appear at any time. This dynamism invalidates a In early versions of UNIX, the exact set of devices number of assumptions that have been made in the on the system had to be compiled in to the kernel. If kernel, in external programs, and even in standards the administrator attempted to use a device which such as SNMP. This paper explores the history of was compiled in, but not installed, a panic or hang the transition of network interfaces from static to dy- was nearly certain. This system was easy to pro- namic. Issues raised by these changes are discussed gram and efficient to execute. Unfortunately, it was and possible solutions suggested. -
Absolute BSD—The Ultimate Guide to Freebsd Table of Contents Absolute BSD—The Ultimate Guide to Freebsd
Absolute BSD—The Ultimate Guide to FreeBSD Table of Contents Absolute BSD—The Ultimate Guide to FreeBSD............................................................................1 Dedication..........................................................................................................................................3 Foreword............................................................................................................................................4 Introduction........................................................................................................................................5 What Is FreeBSD?...................................................................................................................5 How Did FreeBSD Get Here?..................................................................................................5 The BSD License: BSD Goes Public.......................................................................................6 The Birth of Modern FreeBSD.................................................................................................6 FreeBSD Development............................................................................................................7 Committers.........................................................................................................................7 Contributors........................................................................................................................8 Users..................................................................................................................................8 -
MNHO-068 DATASHEET Intel® J1900 4 LAN 1 COM Wifi 4G Firewall Router Mini Server
MNHO-068 DATASHEET Intel® J1900 4 LAN 1 COM WiFi 4G Firewall Router Mini Server https://www.pondesk.com/product/MNHO-068 Features ● Small Security Gateway, Firewall Router, Mini Server ● Intel® Celeron® J1900 Quad Core Processor ● 4 Threads, 2M Cache, up to 2.42 GHz ● Four Intel 82574L Gigabit Ethernet ● Support Network wake-up/PXE ● RJ45-DB9 COM (Cisco Standard) ● Support WiFi, 3G/4G WWAN Networks (optional) ● Watchdog (L256, 0~255 seconds) ● Support up to 8GB DDR3L Memory ● Support Dual Storage (mSATA SSD & 2.5" SATA SSD/HDD) ● VGA Display, USB 2.0 ● Intel® HD Graphics ● Energy Efficient 10W (idle) Low Power Consumption ● Ready for IoT - Simply Connected Using 3G/4G LTE via Mini PCIe ● Support Windows/Linux/Unix/MikroTik/Firewalls etc. ● Can be configured as a Firewall, LAN/WAN Router, VPN, DNS Server, DHCP Server ● Perfect for Security Gateway, Server, VPN and Firewall such as pfSense, Untangle, ● Sophos, Smoothwall, ClearOS, m0n0wall etc. Specifications Dimensions Processor Advanced Technologies Intel® Celeron® Processor J1900 Intel® Virtualization Technology (VT-x) 4 Core, 4 Threads Intel® 64 2M Cache, up to 2.42 GHz Enhanced Intel SpeedStep® Technology Memory Onboard I/O Support up to 8GB 1 x JVGA1 (2*12pin) W DDR3L SODIMM 1.35V Low Voltage 1 x SYS FAN (1*3pin) Single Sided non-ECC Memory 1 x CPU FAN (1*4pin) One Memory Slot 1 x ATX_4P +12V 1 x COM (2*5pin) Storage 1 x SATA2.0 Support 1 x mSATA SSD 1 x JLAN_LED (2*8pin) L H Support 1 x 2.5" SATA SSD/HDD 1 x Full height mini PCIe (For WiFi & 3G module) LAN 1 x mSATA (For SSD) 197mm -
Governance Structures of Free/Open Source Software Development
Uitnodiging GOVERNANCE STRUCTURES OF FREE/OPEN 51 SOURCE SOFTWARE DEVELOPMENT Voor het bijwonen van de George Dafermos openbare verdediging van het Modularity theory makes a compelling argument: modular product design increases the potential number of persons that could work on a distributed project and has a positive effect proefschrift: on their labour productivity because it allows them to work independently of each other, with little or no need for central coordination. This doctoral dissertation sets out to put this argument to the test by studying a phenomenon that combines both scale and modularity: Governance Structures Free and open source software (FOSS) development. Its central question is: Does modularity mitigate the adverse effects of increasing scale in FOSS development? of Free/Open Source Software Development In exploring the effect of modularity and increasing scale on the dynamic of development of FreeBSD, a large and well-known FOSS project, over a period of fifteen years, the dissertation addresses several related empirical issues: How are FOSS projects organised? How are they governed? And most interestingly, how do they manage increasing scale? Does their ability to self-organise diminish as they grow larger, thereby necessitating hierarchical coordination? Op maandag 10 december 2012 om 15 uur precies in de Frans Source Software Development Source Software Governance Structures of Free/Open van Hasseltzaal van de Aula van de Technische Universiteit Delft, Mekelweg 5 te Delft The Next Generation Infrastructures Foundation George Dafermos represents an international consortium of knowledge institutions, market players and governmental bodies, which joined forces to cope with the challenges faced Governance Structures by today’s and tomorrow’s infrastructure systems. -
Netmap: a Novel Framework for Fast Packet I/O
netmap: a novel framework for fast packet I/O Luigi Rizzo,∗ Universita` di Pisa, Italy Abstract high rate raw packet I/O required by these applica- tions is not the intended target of general purpose OSes. Many applications (routers, traffic monitors, firewalls, Raw sockets, the Berkeley Packet Filter [14] (BPF), the etc.) need to send and receive packets at line rate even on AF SOCKET family, and equivalent APIs have been very fast links. In this paper we present netmap, a novel used to build all sorts of network monitors, traffic gen- framework that enables commodity operating systems erators, and generic routing systems. Performance, how- to handle the millions of packets per seconds traversing ever, is inadequate for the millions of packets per sec- 1..10 Gbit/s links, without requiring custom hardware or ond (pps) that can be present on 1..10 Gbit/s links. In changes to applications. search of better performance, some systems (see Sec- In building netmap, we identified and successfully re- tion 3) either run completely in the kernel, or bypass the duced or removed three main packet processing costs: device driver and the entire network stack by exposing per-packet dynamic memory allocations, removed by the NIC’s data structures to user space applications. Ef- preallocating resources; system call overheads, amor- ficient as they may be, many of these approaches depend tized over large batches; and memory copies, elimi- on specific hardware features, give unprotected access to nated by sharing buffers and metadata between kernel hardware, or are poorly integrated with the existing OS and userspace, while still protecting access to device reg- primitives. -
Network Stack Virtualization for Freebsd 7.0 Marko
Network stack virtualization for FreeBSD 7.0 Marko Zec [email protected] University of Zagreb September 2007. Network stack virtualization for FreeBSD 7.0 slide 1 of 64 Tutorial outline ● Network stack virtualization concepts ● Management interface ● Application scenarios ● Implementation in FreeBSD 7.0 kernel Network stack virtualization for FreeBSD 7.0 slide 2 of 64 Tutorial outline ● Hands-on work encouraged! ● Bootable system image alternatives: – USB stick – LiveCD – VMWare player image ● Neither option will touch anything on your HD ● If already running a recent 7.0-CURRENT, you'll need to copy the kernel from the stick or CD, or compile your own Network stack virtualization for FreeBSD 7.0 slide 3 of 64 Tutorial outline ● Virtualized networking == preview technology – What we learn / try out today might look different in 3 months, particularly the management API – Your input may influence the final version of the virtualization framework ● Do not hesitate to ask questions! Network stack virtualization for FreeBSD 7.0 slide 4 of 64 Server virtualization: two sides of the spectrum VM #1 VM #2 Applications Applications VM #1 VM #2 Operating System Operating System Applications Applications Virtual Machine Virtual Machine Private Resources Private Resources (network, CPU...) (network, CPU...) Virtual Machine Monitor Operating System Physical Machine Physical Machine Strong isolation model Efficient resource utilization Independent OS instances No extra I/O overhead VM migration possible Scaling Network stack virtualization for FreeBSD 7.0 -
Kratka Povijest Unixa Od Unicsa Do Freebsda I Linuxa
Kratka povijest UNIXa Od UNICSa do FreeBSDa i Linuxa 1 Autor: Hrvoje Horvat Naslov: Kratka povijest UNIXa - Od UNICSa do FreeBSDa i Linuxa Licenca i prava korištenja: Svi imaju pravo koristiti, mijenjati, kopirati i štampati (printati) knjigu, prema pravilima GNU GPL licence. Mjesto i godina izdavanja: Osijek, 2017 ISBN: 978-953-59438-0-8 (PDF-online) URL publikacije (PDF): https://www.opensource-osijek.org/knjige/Kratka povijest UNIXa - Od UNICSa do FreeBSDa i Linuxa.pdf ISBN: 978-953- 59438-1- 5 (HTML-online) DokuWiki URL (HTML): https://www.opensource-osijek.org/dokuwiki/wiki:knjige:kratka-povijest- unixa Verzija publikacije : 1.0 Nakalada : Vlastita naklada Uz pravo svakoga na vlastito štampanje (printanje), prema pravilima GNU GPL licence. Ova knjiga je napisana unutar inicijative Open Source Osijek: https://www.opensource-osijek.org Inicijativa Open Source Osijek je član udruge Osijek Software City: http://softwarecity.hr/ UNIX je registrirano i zaštićeno ime od strane tvrtke X/Open (Open Group). FreeBSD i FreeBSD logo su registrirani i zaštićeni od strane FreeBSD Foundation. Imena i logo : Apple, Mac, Macintosh, iOS i Mac OS su registrirani i zaštićeni od strane tvrtke Apple Computer. Ime i logo IBM i AIX su registrirani i zaštićeni od strane tvrtke International Business Machines Corporation. IEEE, POSIX i 802 registrirani i zaštićeni od strane instituta Institute of Electrical and Electronics Engineers. Ime Linux je registrirano i zaštićeno od strane Linusa Torvaldsa u Sjedinjenim Američkim Državama. Ime i logo : Sun, Sun Microsystems, SunOS, Solaris i Java su registrirani i zaštićeni od strane tvrtke Sun Microsystems, sada u vlasništvu tvrtke Oracle. Ime i logo Oracle su u vlasništvu tvrtke Oracle. -
Introduzione Al Mondo Freebsd Corso Avanzato
Introduzione al mondo FreeBSD corso Avanzato •Struttura •Installazione •Configurazione •I ports •Gestione •Netstudent http://netstudent.polito.it •E.Richiardone [email protected] •Novembre 2012 •CC-by http://creativecommons.org/licenses/by/3.0/it/ The FreeBSD project - 1 • E` un progetto software open • Lo scopo e` mantenere e sviluppare il sistema operativo FreeBSD • Nasce su CDROM come FreeBSD 1.0 nel 1993 • Deriva da un patchkit per 386BSD, eredita codice da UNIX versione Berkeley 1977 • Per problemi legali subisce un rallentamento, release 2.0 nel 1995 con codice royalty-free • Dalla release 4.0 (2000) assume la struttura che ha oggi • Disponibile per x86 32 e 64bit, ia64, MIPS, ppc, sparc... • La mascotte (Beastie) nasce nel 1984 The FreeBSD project - 2 • Erede di 4.4BSD (e` la stessa gente...) • Sistema stabile; sviluppo uniforme; codice molto chiaro, ordinato e ben commentato • Documentazione ufficiale ben curata • Licenza molto permissiva, spesso attrae aziende per progetti commerciali: • saltuariamente progetti collaborano con implementazioni ex-novo (i.e. Intel, GEOM, NDISwrapper, ZFS, GNU/Linux emulation) • Semplificazione di molte caratteristiche tradizionali UNIX Di cosa si tratta Il progetto FreeBSD include: • Un sistema base • Bootloader, kernel, moduli, librerie di base, comandi e utility di base, servizi tradizionali • Sorgenti completi in /usr/src (~500MB) • E` gia` completo (i.e. ipfw, ppp, bind, ...) • Un sistema di gestione per software aggiuntivo • Ports e packages • Documentazione, canali di assistenza, strumenti -
Virtual Memory
M08_STAL6329_06_SE_C08.QXD 2/21/08 9:31 PM Page 345 CHAPTER VIRTUAL MEMORY 8.1 Hardware and Control Structures Locality and Virtual Memory Paging Segmentation Combined Paging and Segmentation Protection and Sharing 8.2 Operating System Software Fetch Policy Placement Policy Replacement Policy Resident Set Management Cleaning Policy Load Control 8.3 UNIX and Solaris Memory Management Paging System Kernel Memory Allocator 8.4 Linux Memory Management Linux Virtual Memory Kernel Memory Allocation 8.5 Windows Memory Management Windows Virtual Address Map Windows Paging 8.6 Summary 8.7 Recommended Reading and Web Sites 8.8 Key Terms, Review Questions, and Problems APPENDIX 8A Hash Tables 345 M08_STAL6329_06_SE_C08.QXD 2/21/08 9:31 PM Page 346 346 CHAPTER 8 / VIRTUAL MEMORY Table 8.1 Virtual Memory Terminology Virtual memory A storage allocation scheme in which secondary memory can be addressed as though it were part of main memory.The addresses a program may use to reference mem- ory are distinguished from the addresses the memory system uses to identify physi- cal storage sites, and program-generated addresses are translated automatically to the corresponding machine addresses. The size of virtual storage is limited by the ad- dressing scheme of the computer system and by the amount of secondary memory available and not by the actual number of main storage locations. Virtual address The address assigned to a location in virtual memory to allow that location to be ac- cessed as though it were part of main memory. Virtual address space The virtual storage assigned to a process. Address space The range of memory addresses available to a process.